Maybe it's the crankshaft that has a little forward/back play in it now after 229,000 miles rather than the mount of the AC compressor. I forget what technical term they call that "play" in engine building land.Wow. Thanks for this helpful insight. Like yours, mine seems to be happening under hard acceleration. What’s strange though is it was fine for 229K, AFAIK so it’s hard to imagine that the mount got tweaked.
Very cool video!
Edit: "End Play"